Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc8b3aebd8e54351…

MALICIOUS

PDF

83.3 KB Created: 2021-09-23 02:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0129db27d4e0a1fb99d08cd29bb0814d SHA-1: 1fc6ca11144d2134f8a6b220b4fdb4a727e545ba SHA-256: fc8b3aebd8e54351e61d944541ed6508623297b23ec0676f7ef973b1a877f38e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various websites, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/1h1n6oba2cgm5228gk23703bnn/sonasizazebu.pdf In PDF document text
    • https://goodmix-psc.com/userfiles/files/sowifedaguseviko.pdfIn PDF document text
    • http://bertoniamministrazione.it/bertoni/public/file/batimugadekadag.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/nesebanu.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146666a6ee00---29298048629.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/segokesogojim.pdfIn PDF document text
    • http://enricobarraco.com/files/352834198.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/6e960a68b61ef064b8673da3b510ab3b/2325677928.pdfIn PDF document text
    • http://80tner.friend-match.com/upload/files/20557517082.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210922_3F1A021C66A60AA6.pdfIn PDF document text
    • http://nfrostov.ru/upload/files/48755904200.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia/files/welimapobumifetefuwifiv.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/b843beea199765d731444428f5601efe/rililikusamajibinuzav.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/lanijoxoxikozututikadu.pdfIn PDF document text
    • http://rs-entp.com/upload/file/54160888422.pdfIn PDF document text
    • https://bientannamhuy.com/wp-content/uploads/files/kigajerojadaz.pdfIn PDF document text
    • http://sin-hua.org/userfiles/54573269452.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16145f367d622a---depeletosufofidizuwuked.pdfIn PDF document text
    • https://bselink.com/userfiles/file/jijaxuvebuvupu.pdfIn PDF document text
    • http://lysfyyy.com/upload/files/xosojukajapubibaj.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/jobuduwurini.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/zijuzivazogi.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/kikoxisubopebonabajisil.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/060801451455.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/kigitoneganupiwepoziduz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=winning+eleven+2012+game+apk+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE7 17880 bytes
SHA-256: 68b40b69ac9dd2abf2e0ee3390a90657fa06a4b42699ef20aacb5618df89bd85
font_01_sfnt_off00010dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DDE 10900 bytes
SHA-256: be098d2f4c967d94561b2ea65a5200717664f31bccde6d85e38844b41a91d203
font_02_sfnt_off000126e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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